Governor valve

Abstract

A governor valve for a hydraulic controller in an automatic transmission, which is disclosed herein, comprises an adapter having a line pressure supply bore made therethrough, a cylindrical governor rotary shaft loosely fitted into the adapter sleeve and having a line pressure supply port made therein, the port including notches intersecting the axis at right angles, a centrifugal weight mounted on one end of the governor rotary shaft and having a return spring, and a spool adapted to slide within the governor rotary shaft with the weight being urged against one end thereof. In this governor valve, there are provided dirt and dust collecting means for preventing dirt and dust separated by a centrifugal action from collecting in the line pressure supply port during the stoppage of the governor rotary shaft so as to make the shaft stick.

What is claimed is: 
     
       1. A governor valve, adapted for mounting in a transmission casing, said valve comprising: an adaptor sleeve having a line pressure supply bore and a governor pressure output bore made therethrough;   a cylindrical governor rotary shaft rotatably fitted into said adaptor sleeve and having a line pressure supply port connected to said line pressure supply bore and a governor pressure output port connected to said governor pressure output bore;   a centrifugal weight mounted on one end of said governor rotary shaft;   a spool adapted to slide with said governor rotary shaft to connect said line pressure supply bore to said governor pressure output bore according to said weight; and,   said adapter sleeve further having a dust collecting bore connected to said line pressure supply bore in a transmission casing with a clearance between an outer periphery thereof and a wall of said transmission casing, to leak oil in said line pressure supply port to said clearance through said dust collecting bore.   
     
     
       2. A governor valve according to claim 1, wherein said adapter sleeve has a notch extending in a circumferential direction from the dust collecting bore. 
     
     
       3. A governor valve according to claim 1, wherein said governor rotary shaft comprises: a groove around an outer periphery thereof at an opposite end from the weight; a weir around an outer periphery thereof disposed between said groove and said line pressure supply port; and, a sealing ring mounted in said groove and adapted to permit oil to leak therethrough.